American Airlines Raises Fuel-Cost Guidance, Traffic Falls in January

Traffic Rises at Rival Southwest Airlines

American Airlines Group Inc. reported slightly lower traffic for January and raised its fuel-cost guidance for its first quarter, citing the recent uptick of prices, while traffic at rival Southwest Airlines Co. rose.

Southwest said its traffic improved 8.6% from January 2014. The percentage of seats filled, or load factor, fell to 75.1% from 76.3%. However, total capacity was up 10.2% from the year earlier. Southwest shares fell...